Comment by mattmanser

Nah, in the UK it's now fairly uncommon to still have a hot water tank. Most houses have mixer taps, and new fittings for bathrooms or kitchens will have mixer taps unless the home owner is masochist.

The separate taps thing is more because it costs to replace a sink. So even if you put a new boiler in an old houses lots of people aren't going to replace the fittings in the kitchens and bathrooms at the same time.